Input: usbtouchscreen - add support for e2i touchscreen controller

This patch adds support for the e2i touchscreen controller used in the
Mimo 740 (and probably in other e2i touchscreen products). Tested on
Mimo 740.

Signed-off-by: Florian Echtler <floe@butterbrot.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

2 files changed, 54 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 07703bc..87a1ae6 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -474,6 +474,11 @@ config TOUCHSCREEN_USB_JASTEC
 	bool "JASTEC/DigiTech DTR-02U USB touch controller device support" if EMBEDDED
 	depends on TOUCHSCREEN_USB_COMPOSITE
 
+config TOUCHSCREEN_USB_E2I
+	default y
+	bool "e2i Touchscreen controller (e.g. from Mimo 740)"
+	depends on TOUCHSCREEN_USB_COMPOSITE
+
 config TOUCHSCREEN_TOUCHIT213
 	tristate "Sahara TouchIT-213 touchscreen"
 	select SERIO
diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c
index c07be07..68ece58 100644
--- a/drivers/input/touchscreen/usbtouchscreen.c
+++ b/drivers/input/touchscreen/usbtouchscreen.c
@@ -120,6 +120,7 @@ enum {
 	DEVTYPE_GENERAL_TOUCH,
 	DEVTYPE_GOTOP,
 	DEVTYPE_JASTEC,
+	DEVTYPE_E2I,
 };
 
 #define USB_DEVICE_HID_CLASS(vend, prod) \
@@ -197,11 +198,47 @@ static struct usb_device_id usbtouch_devices[] = {
 	{USB_DEVICE(0x0f92, 0x0001), .driver_info = DEVTYPE_JASTEC},
 #endif
 
+#ifdef CONFIG_TOUCHSCREEN_USB_E2I
+	{USB_DEVICE(0x1ac7, 0x0001), .driver_info = DEVTYPE_E2I},
+#endif
 	{}
 };
 
 
 /*****************************************************************************
+ * e2i Part
+ */
+
+#ifdef CONFIG_TOUCHSCREEN_USB_E2I
+static int e2i_init(struct usbtouch_usb *usbtouch)
+{
+	int ret;
+
+	ret = usb_control_msg(usbtouch->udev, usb_rcvctrlpipe(usbtouch->udev, 0),
+	                      0x01, 0x02, 0x0000, 0x0081,
+	                      NULL, 0, USB_CTRL_SET_TIMEOUT);
+
+	dbg("%s - usb_control_msg - E2I_RESET - bytes|err: %d",
+	    __func__, ret);
+	return ret;
+}
+
+static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
+{
+	int tmp = (pkt[0] << 8) | pkt[1];
+	dev->x  = (pkt[2] << 8) | pkt[3];
+	dev->y  = (pkt[4] << 8) | pkt[5];
+
+	tmp = tmp - 0xA000;
+	dev->touch = (tmp > 0);
+	dev->press = (tmp > 0 ? tmp : 0);
+
+	return 1;
+}
+#endif
+
+
+/*****************************************************************************
  * eGalax part
  */
 
@@ -734,6 +771,18 @@ static struct usbtouch_device_info usbtouch_dev_info[] = {
 		.read_data	= jastec_read_data,
 	},
 #endif
+
+#ifdef CONFIG_TOUCHSCREEN_USB_E2I
+	[DEVTYPE_E2I] = {
+		.min_xc		= 0x0,
+		.max_xc		= 0x7fff,
+		.min_yc		= 0x0,
+		.max_yc		= 0x7fff,
+		.rept_size	= 6,
+		.init		= e2i_init,
+		.read_data	= e2i_read_data,
+	},
+#endif
 };